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    <title>Document</title>
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    <script>

        // 赋值运算符    =     +=     -=     *=    /=     %=

        var a = 1 ;

        // a = a + 1 ;
        // 简写
        a += 1 ;
        console.log(a);   // 2

        a %= 5 ;
        console.log(a);   // 2

    </script>
    
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